feat(gui): Upgrade to high-res 800x600, sharp 8x16 font, IRQ12 PS/2 mouse driver, and polished window manager

- Upgrade resolution to 800x600 @ 32bpp TrueColor with Bochs/QEMU VBE LFB
- Implement full 8042 Aux PS/2 mouse controller driver on IRQ 12 (vector 44) with packet decode and bounds clamping
- Add high-definition 8x16 font rasterizer with text drop shadows for sharp typography
- Upgrade to smooth 16x24 anti-aliased cursor with dark slate outline and drop shadow
- Increase titlebars to 24px and taskbar to 32px with modern desktop styling
- Re-architect applications (SysMon, Terminal, Explorer, Calc, Paint, About) for spacious high-res display

include/gui/gui_wm.h

@@ -8,7 +8,7 @@
 #include <gui/gui_theme.h>
 
 #define GUI_MAX_WINDOWS 16
-#define GUI_TITLEBAR_HEIGHT 16
+#define GUI_TITLEBAR_HEIGHT 24
 
 typedef enum {
     GUI_EVENT_MOUSE_MOVE,
@@ -32,7 +32,7 @@ typedef struct {
 
 typedef struct gui_window {
     int id;
-    char title[48];
+    char title[64];
     int x;
     int y;
     int width;